SOUTH
ET
‐
02/05
ELECTRONIC
THEODOLITE
SERVICE
MANUAL
20
SOUTH
SURVEY
&
MAPPING
INSTRUMENT
CO.,
LTD.
20
Adjust the horizontal clamp and tangent screw to make the
horizontal angle value to half of the difference as 180º00'20".
Then sight at the horizontal collimator, and observe how much the deviation, which is shown in the gray field,
is from the graduation. Take off the reticle cover, and adjust the left and right adjusting screws to make the
vertical reticle back to the graduation. The working principle is that we should loosen an adjusting screw firstly,
and then tighten another screw.
After the adjustment, check the 2C error again. If it does not conform to the requirement, please repeat the
adjustment above.
5.
High-low Difference
Turn the instrument to circle left and aim crosshairs at a certain
graduation in the collimator, note down the corresponding grid
value on the horizontal crosshairs. Then tighten the horizontal
clamp.
Loosen the vertical clamp, rotate the telescope and sight at the
lower collimator, note down the corresponding grid value on the
vertical crosshairs. Be aware that the corresponding grid value
between the vertical crosshairs and horizontal crosshairs may be
different.
Rotate the instrument to circle right, sight the vertical crosshairs
at the former value and tighten the vertical clamp.
Loosen the vertical clamp; rotate the instrument and sight at the
low collimator. As shown in the figure, compare two
corresponding grid values and note down whether the high-low
difference value is within 10” which is one third of the mini
graduation. Otherwise, it needs to be adjusted. As shown in the
figure, the difference, which exceeds the permissible range, is
over two mini graduations
Disassemble four center covers according to the step 11 of the
theodolite disassembly procedure. Use allen key to adjust four
LEFT
‐
HR
LEFT
‐
LOW
RIGHT
‐
HR
RIGHT
‐
LOW
